panic: assertwaitok: non-zero mutex count: 1
Starting stack trace...
panic(ffffffff8302acd2) at panic+0x1d0 sys/kern/subr_prf.c:229
assertwaitok() at assertwaitok+0x19b sys/kern/subr_xxx.c:163
mi_switch() at mi_switch+0x35c sys/kern/sched_bsd.c:412
preempt() at preempt+0x6a sys/kern/sched_bsd.c:338
ast(ffff8000371a23e0) at ast+0x165 mi_ast sys/sys/syscall_mi.h:261 [inline]
ast(ffff8000371a23e0) at ast+0x165 sys/arch/amd64/amd64/trap.c:541
intr_user_exit() at intr_user_exit+0x3c
end of kernel
end trace frame: 0x7aac4f917660, count: 251
End of stack trace.